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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b47570ed1e8b3f1ab24f581b6df9e832207dace23aaf2b62e308c7a5572100' 
  AND token = 'YVO8LS9Nz4m4d33KHpTrd6SDmjBc6K628af3oLuMdGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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