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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74d196efe8ef30985d149659a2e578fdcfdaa78c182066733483e305f2a9fdea' 
  AND token = 'LPDOm70lfJNFSjGQTZluAhlFF8Z9/nJ4eln53GWa5ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}