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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca96ace418318c821061ad82d48a4909647a4cceea4cabf15bc25440e00978ed' 
  AND token = '4Le24EGMWSAlVl18xBeovS8Z5r+R05WBhul/X1WVMpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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