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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba9031a7a37c7f716519ba5913c8bd0e3a71529175c2b4c0abd03f90001f7b4' 
  AND token = 'pl/1Zonxa4EnB3V3RPS4Dh9ch29K9lZEO9b/jjai9EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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