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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cba476545330aa3bdbae34efc5427decd8925ec3b5c9c98ecfb92b08a0cccaf' 
  AND token = '6ZbpJUE6l3/0jYqmbBkdkHP8mmoEh8yQq8H4yBwv0Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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