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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5363f7cf15bae76de90cab982d39db639326157110efc5e0dc3e72cca977a36f' 
  AND token = '93P/eqyjnl0cN1AvIu8u8qe/2RWE2FMuZO/F3SSO2Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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