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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc55c84ac6b3e761f2c827e227c9d9b08a9362f087f78537eb6a7559cae76b6a' 
  AND token = 'sEPtsRlhVwEb741Q6ThApBf5yrczoiwScyY3PCoaTF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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