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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12697aaa8fdd4897ec98b0aed117c1935c460aae2efc327c73966e125ad549d6' 
  AND token = 'gw4oxou6+4EH9nSEU8CzWggyEKBAV0sDfHkdh21ZGZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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