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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d5b038255fbf35d0e2edfe426684e87bac2c8db816acc943059012e18b7573c' 
  AND token = '3yU7xpugy7fQlRf560+IABhJ40ei2W/apPeHofyEkm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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