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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c750626c95e30d75ada41327146fe8e6bae0acead30d3ab51418194d4e8a0976' 
  AND token = 'r/ljrsz8ZbOQm8Y/QUg/U/8mXg4Lq1xK7X8pUd5qzLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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