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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65e432c10dfe4aa9c82302c883f9738f91a5671e9c61b22134bd6570b43d1411' 
  AND token = 'l5LefjLxcAMssi/cXjyxLZIhj9xb++TB9MD7sGNEbPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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