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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '294ba20e7c3c3fdd3e48bc35c7f0d83dcd9a0bc0eb144163fe246d0e01eed93d' 
  AND token = '3mUGTsPZLvcBQHCB6RS39X6Lbg1Xivs3hHc3k5mlZ1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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