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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7db2e31bdb436a5ce91f8db8b1cce7971dac6961b3dd473104dad73933e171' 
  AND token = '7nv+5tAvq8TiATDGtAxdyxdCpOe4a1YoDlp0xhUDjWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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