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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d88814cdac724c3db8aac21cfee3c6c1280eee88b458b637750f55ec3cb3918' 
  AND token = 'hcDcag7SOgYn9gXZ1SVerwx4/jK+DsCNmQlfhlNAHSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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