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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98740c6b7d1f83f939479056cd3e9017d94f084433009a48ace50725f8128197' 
  AND token = 'gEpmkaFvv/A9y07A4QJda3MwzUdZCmwPjwjoXzSOF/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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