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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0dc4c7e26a33abe1cc2972eebe8cc753b504a10436b0b13e6905316ae236e51' 
  AND token = 'i2JmS1nwWdeN7trPk5SeOn0QlWGRvGbKhwXnHVDoOMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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