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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3315c19c7e164fe31c5807ae5008e143975257de0b66d9d179e54d96798ffe' 
  AND token = 'sM2hZyBv33LUUZxV/zTXHVtp0ahUQe7rydcuU9IALUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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