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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd931d46e26c286063970919908b25d4d07805f562b6c8bb5959ee0318eb9561f' 
  AND token = 'KjdxHPBRtpIo8fWUqum1t+w0onQD6jnwr137KENNkU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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