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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b5a90216981e853b26aab3f4094ab92a65adc8d6adba5038f63c899bde3288' 
  AND token = 'm1I5+fvBePM83VVA7CPd7/VzCB95zuxZVr8RrxMnq78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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