SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a560167140825f16ec9f7b26196a035cd68ddb6b4acbcc8ec3787b6f6e449815' 
  AND token = 'ghI0HRBV52YiiGgXVQtrwvurvNEtIYO/K5xmOakT620=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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