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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f9eb59fe708122e5a15560d1e0715df561dd4ef940e3cf43a7a79259bb7a4c' 
  AND token = 'DE5Eh75pVssr3m/98gLQFCX4J7GqWYRlSYTDDfhuj4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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