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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ef08bf9c8e2ce861456a1dc7934bac676f65df65592b0c6a71b252c6e10fa1' 
  AND token = 'AYjAL5mwIDB7NRk3DwlRybWw/ecRhLqKhZTS55eoAxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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