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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2190d566e5c8a04aacb24c15a2d1302e0e2ee0f17639db7eb5351e36471c6c1a' 
  AND token = 'J/V//QX7hebi9O2ZVOKnIy7f4hh3LPbiB18JiBnCF9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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