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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc646fb281004e7225f7525146a3bf7dc2f467d56916e1950fadcbe7ede2a16b' 
  AND token = 'KYMabd8mbo2sxuV5wXMQxc3IMKx7oieIfzRp7OqwlaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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