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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb070a34ab2fc0907512fa147bcc7e07eef0f7d4ca6927ca4baf26e9bf83ed00' 
  AND token = 'uRHajsF0Zc/t/1ZAwWMOSXd1Dyo0+T/fLZV4O1l/22s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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