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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf2e6dd9409a16fa233b5000bf138600a2d9894255cbda34bcced4ce446e0ce2' 
  AND token = 'arXX5fxj+dNbcHqScO2NNMxt4/qpvYFYuXODR11zg/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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