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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94379ddcdf2c1ec21ede87cd6d099df75313e754f48e42be31bfcf2563f2603' 
  AND token = 'TqDttt4AhPGJsluuc8FXIzIiR4IIDPaaObu4772H0XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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