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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec0e98bc850e66031ba3a7c791f9dd7bf33a62ac5dffaee2c437316da92dc42' 
  AND token = 'OuNaDHYb4eS379U3u0TQXVA2Ol0JhBXrI0//qJwkmGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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