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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213d8b1a4157018a73ae7ed4ebe08f0980ced0d412e3f810dd6d0d088e8ad24d' 
  AND token = 'AV27HFxbuWw81Gk00D+/ZoD3EhKc6ODxOwYj778Jpic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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