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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833bd0b6181fc38c3ed8fbcdf699d2a03d536314e2f015068de0502e797e7075' 
  AND token = '/jf4/phtCvAPKGhCEAhkppRenpbRt6N6j8B+cEIVU9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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