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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc7bff66d700d7bde883be5c58d61fa8a5c5150d9e03a5e57ce400e038827a4' 
  AND token = 'W5EBd2vab3+bJyYZmgON546pftz8TZma/LQciqFxbFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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