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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b1308b748cf4d422a6beaeb775d2696c9acd3b94511c1b5cccfdd27f72522a' 
  AND token = 'y165Z6Rs9AQwv/+0cYNvwd5xSy2JGYNCMRDtDEv+SKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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