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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d9707288f3be020c7c2752a044ef54dc7037cc7b8be6fa39041389ea3f6530' 
  AND token = 'bh91ooM/CNLs8o7RAsncH82t52NMn6u3ptJLZyh6NQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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