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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbcc0e1cfc72cab6e3b7904a8ef200d959db8c77d936bdf10bed1238cd1e5e90' 
  AND token = '8lADdD54a+oTzJCAAIibADF1XDCWWCCMZ4vqur4HV7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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