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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bec251eb3ddfb8e619cfd4f2bcd3905dd4fbdcbd7bbd8a27d159676f93197d4' 
  AND token = 'mA7KuPt8bztNi90fiaI/mknAoh9wmfCPyZC5LKYpNSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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