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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03021d731ad6c734636668fe9366c1272ba36327fa06d9b1854c0ba4790c1445' 
  AND token = 'oxg1jauNxO0LuYAeWElWFv93K0271ZSGLF3bXiGI3Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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