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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd54c0757c81645f2b7fc4cff874b87ca2d3997e2916307a2be06cf326dedafc' 
  AND token = 'gKT4pjiKP00klML2sh1jSH2DfCarwomohaqyIv0Ln9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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