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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2799e96e95e6a02a62434e626aa838a506aad7f3fe4d9a8ea6877253b14a0c3a' 
  AND token = 'jWp/1LVWWjR4cKcO7H20Y4o91w8ASOce8L2uYOs8By4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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