SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c8a313b73c1f56fd53a971903d9c8f768284bbe58f2ba93603c166161477a4' 
  AND token = 'wGm0SeYiZkxg91Jv7xtxP3gJjX4uN+eY/s1GIRiZiPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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