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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d16ad0f6514aacf7e118765413177f0616fbe656c21f878611c56feb924831' 
  AND token = 'O7XSG6ZOOx06rdG8+pjNKzhOQ2xy9iBp5ejLCuY4kkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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