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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ecd921777f62630df4256788107a7fc91547bd7b9027c9fcb34b0db1d05ed1' 
  AND token = 'dN3KoFCV1+yVm/uI6LD9Me05VkXfp1h6RDniPeWhqBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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