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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '573f0aa511c3cae75bd0a999b2fd4b1357a2e22d203b879c81691ce08d37e354' 
  AND token = 'd3I41NLqx9wcQcDRmRdu4RA0NaNdsBeueS/PFeA+T+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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